Hi,
thx for the advise.
The grabber was connected to an old USB 2.0 hub. I just bought a new USB 3.0 hub to check if it is power related.
I turned down the priority to 600, the internal grabber is disabled.
It is still not working.
Additionally I'm not able to grab a Picture by selecting "get Picture from grabber" anymore.
If I try to the I'm getting a "Wait Indicator" from Windows, which only stops when I reboot the Pi.
Another question, Hyper con related, why does it not load all the Settings from my dat file when I start a new instance? Things like Output (to Arduino) "Bautrate" are always pointing to Defaults.